Updated header and added not found page

src/components/header.tsx

@@ -0,0 +1,17 @@
+import Link from "next/link"
+import { SearchBar } from "./search-bar"
+import { ThemeSwitcher } from "./theme-switcher"
+
+export default function Header({ searchBar = false }: { searchBar?: boolean }) {
+    return (
+        <header className="fixed w-screen bg-background/50 backdrop-blur-sm">
+            <nav className="flex justify-between items-center px-6 border-b h-header">
+                <Link href="/">
+                    <span className="text-lg font-semibold">Hypixel Stats</span>
+                </Link>
+                {searchBar && <SearchBar navbar />}
+                <ThemeSwitcher />
+            </nav>
+        </header>
+    )
+}